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Saturday, 31 October

JEE Main · Chemistry · Equilibrium

pH of Weak Acid-Weak Base Salts

JEE Main asked pH of Weak Acid-Weak Base Salts 4 times in 4 of the 108 shifts Lumi analysed, in 2017, 2021 and 2024. It belongs to pH and Buffers, in Equilibrium (Chemistry). The longest wait between two years asking it was 4 years, across 2018 and 2019, which Lumi has no shifts for. In 2024 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
4
in 4 shifts
Years
3 of 8
First asked
2017
last in 2024
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2017, 2021 and 2024. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.510.83’170’200.03’210’220’230.09’240’250’26

Raw count: 2017: 1 in 1 shift · 2020: 0 in 12 shifts · 2021: 1 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 2 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20242 of 18
  • 20230 of 12
  • 20220 of 24
  • 20211 of 24
  • 20200 of 12
  • 20171 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Ph of weak acid weak base salt
  • Statement i/ii on salt hydrolysis

Difficulty

Easy 3Medium 0Hard 1

2 of the 4 questions had a numerical answer.

Every question

All 4 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 27 Jan 2024, Shift 1 · Q63Given below are two statements : Statement (I) : Aqueous solution of ammonium carbonate is basic. Statement (II) : Acidic/basic nature of…EasyTwo statements
  2. 1 Feb 2024, Shift 1 · Q83Ka\mathrm{K_a} for CH3COOH\mathrm{CH_3COOH} is 1.8×10−51.8\times10^{-5} and Kb\mathrm{K_b} for NH4OH\mathrm{NH_4OH} is 1.8×10−51.8\times10^{-5}. The pH of…EasyNumerical value
  3. 26 Feb 2021, Shift 2 · Q56The pH of ammonium phosphate solution, if pkapk_a of phosphoric acid and pkbpk_b of ammonium hydroxide are 5.23 and 4.75 respectively, is…HardNumerical value
  4. 2 Apr 2017 (offline) · Q40pKapK_a of a weak acid (HA) and pKbpK_b of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :EasySingle correct

Shifts: 2 Apr 2017 (offline), 26 Feb 2021, Shift 2, 27 Jan 2024, Shift 1, 1 Feb 2024, Shift 1.

Same topic

Other ideas in pH and Buffers

pH and Buffers has 22 ideas JEE Main has asked; 11 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas